The World As I See It - an essay by Albert Einstein
’ But without deeper reflection one knows from daily life that one exists for other people - first of all for those upon whose smiles and well-being our own happiness is wholly dependent, and then for the many, unknown to us, to whose destinies we are bound by the ties of sympathy ‘
The whole text is in the following link: http://www.aip.org/history/einstein/essay.htm